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Re: NetBSD/ofppc boots multiuser on Pegasos



Simon Burge wrote:
=?ISO-8859-1?Q?Jorge_Acereda_Maci=E1?= wrote:


Simon Burge wrote:


No ideas offhand.  That's a page size which may or may not mean
anything.

I wonder what happens if you do something like:

        dd if=/netbsd of=/tmp/foo bs=4k count=1 seek=1

do you zeros or real data at 0x1000 in /tmp/foo ?  Still, I'm not
sure what that proves either if it works or not...


Interesting. I got two identical chunks at 0x0000 and 0x1000 which are in fact the data at 0x0000 in /netbsd.

Want to hear something really annoying? if I use dd if=/netbsd of=/tmp/foo instead of cp, I get an exact replica.


I think cp uses mmap instead of read, but still uses writes normally?

Maybe try regress/sys/uvm/mmap ?

I have some more information. I compiled a kernel with MFS support and the patches that made regress/sys/uvm/mmap pass. cp from NFS to the ramdisk (or from ramdisk->ramdisk) works correctly. But NFS->NFS and ramdisk->NFS are still broken.

OTOH, copying NFS->NFS using:

cat /bin/ls > /tmp/ls

works correctly.

Interestingly, copying NFS->NFS a 8192 bytes file (or any multiple of 4096) works fine, while copying a 8191 bytes file yields 4096 bytes of correct data plus 4095 zeros.

Any idea?

TIA,
  Jorge Acereda




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